Kenneth G. Halliwell, M.D.
NPI 1639338429ActiveIndividual· Psychiatry & Neurology, Neurology· Williamsville, NY
Psychiatry & Neurology, Neurology (M.D.) in Williamsville, New York, trained at State University of New York at Buffalo School of Medicine (class of 2003). Their prescriptions cost Medicare Part D more than their services did: $573,391 for 178 claims, against $65,307 paid for services in 2024. Avadel Cns Pharmaceuticals, LLC was the largest of 10 companies reporting payments in 2025, $3,882 in all, mostly consulting fees.
Overview
| NPI | 1639338429 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jun 5, 2008 |
| Last updated in NPPES | Feb 28, 2022 |
| Certified by provider | Feb 28, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Psychiatry & Neurology, Neurology Primary | 2084N0400X | 248880 | NY |
| Psychiatry & Neurology, Sleep Medicine | 2084S0012X | 248880 | NY |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Sleep Medicine (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 194 |
|---|---|
| Services billed | 379 across 13 procedure codes |
| Paid by Medicare | $65,307 |
Part D prescriptions in 2024
| Prescriptions (claims) | 178 · 206 30-day fills |
|---|---|
| Patients | 34 |
| Total drug cost | $573,391 |
| Generic share | 76% of claims |
Education and affiliations
| Medical school | State University of New York at Buffalo School of Medicine |
|---|---|
| Graduation year | 2003 |
| Medicare specialty | Sleep Medicine |
| Secondary specialties | Neurology |
| Telehealth | Offers telehealth |
Medical group
- Buffalo Medical Group, P.C.Williamsville, NY · 236 clinicians
Industry payments (Open Payments)
- 2025$3,882 · 31 payments from 10 companies
- 2024$33,426 · 86 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Avadel Cns Pharmaceuticals, LLC | $2,917 | 4 |
| Jazz Pharmaceuticals Inc. | $259.87 | 6 |
| Livanova USA, Inc. | $248.32 | 4 |
| Axsome Therapeutics, Inc. | $171.99 | 8 |
| Inspire Medical Systems, Inc. | $128.69 | 2 |
What the 2025 payments were for
- Consulting Fee$2,800 · 1 payment
- Food and Beverage$1,082 · 30 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 16 neurologists in Williamsville · All neurologists in New York